E-Mon E-PS-A-RTU-N - Manual (Page 72)

Chapter 4 Power
S O F T W A R E G E N E R A L M E T E R S E T U P
72 PowerSmart+ Advanced Power Quality Meter
Using Periodic Timers Using Periodic Timers Using Periodic Timers Using Periodic Timers
The PowerSmart+ Advanced PQM provides two programmable interval timers that can be
used for periodic recording and triggering operations on a time basis via the Control
Setpoints. When a timer interval expires, the timer generates an internal event that can
trigger any setpoint (see
Using Control Setpoints ).
To configure the device timers, select General Setup from the Meter Setup menu,
and then click on the Periodic Timers tab.
To run a periodic timer, specify a non-zero time period for the timer. The time period
can be set from 1 to 9999 seconds.
To stop a timer, set the time period to zero.
Using Control Setpoints Using Control Setpoints Using Control Setpoints Using Control Setpoints
The PowerSmart+ Advanced PQM has an embedded logical controller that runs
different actions in response to user-defined internal and external events. Unlike a
PLC, the meter uses a simplified programming technique based on setpoints that
allows the user to define a logical expression based on measured analog and digital
values that produce a required action.
The meter provides 16 control setpoints with programmable operate and release
delays. Each setpoint evaluates a logical expression with up to four arguments
using OR/AND logic. Whenever an expression is evaluated as “true”, the setpoint
performs up to four concurrent actions that can send a command to the output
relays, increment or decrement a counter, or trigger a recorder.
The logical controller provides very fast response to events. The scan time for all
setpoints is 1/2 cycle time (8.8 ms at 60Hz and 10 ms at 50 Hz).
To program the setpoints, select General Setup from the Meter Setup menu, and
then click on the Control/Alarm Setpoints tab.